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NEETChemistryClassification of Elements and Periodicity in Properties

The increasing order of reactivity among group 1 elements is Li Cl > Br > I. Which of the following options explain this distinction?

Options

  1. AGroup 1 elements are non-metals, while Group 17 elements are metals.
  2. BGroup 1 elements have higher electronegativity, while Group 17 elements have lower electronegativity.
  3. CGroup 1 elements have one valence electron, while Group 17 elements have seven valence electrons.
  4. DGroup 1 elements have higher ionisation energies, while Group 17 elements have lower ionisation energies.

Correct answer

C. Group 1 elements have one valence electron, while Group 17 elements have seven valence electrons.

Step-by-step solution

Correct Option is : (C) Group 1 elements have one valence electron, while Group 17 elements have seven valence electrons.

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